AttributeError: 'tuple' object has no attribute 'format'

Question

I am trying to insert a variable in my code to run a command on a remote linux host, in order to do this i am using the .format method, see my below code:

import paramiko
from datetime import datetime, timedelta

hostnames = [
   'hostname',
]
username = 'username'
password = 'password'
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.load_system_host_keys()
ydate = datetime.strftime(datetime.now() - timedelta(1), '%Y%m%d')

for host in hostnames:
   ssh.connect(host, username=username, password=password, look_for_keys=False)
   ssh.exec_command('cp test.txt {}.mrs_stats0.{}.pytest.gz ; chmod +r {}.mrs_stats0.{}s.gz').format(host, ydate, host, ydate)

I am failing when trying to use {} and .format, with the following error:

Traceback (most recent call last):
  File "C:/Users/IdeaProjects/main.py", line 25, in <module>
    ssh.exec_command('cp test.txt {}.mrs_stats0.{}.pytest.gz ; chmod +r {}.mrs_stats0.{}s.gz').format(host, test, host, test)
AttributeError: 'tuple' object has no attribute 'format'

I cannot understand why i am receiving this error, furthermore i have done some reading to further understand tuples and i cannot understand why my variables are not being read as strings

buran · Accepted Answer · 2020-09-14 12:08:31Z

3

I think you want the last line to be

ssh.exec_command('cp test.txt {}.mrs_stats0.{}.pytest.gz ; chmod +r {}.mrs_stats0.{}s.gz'.format(host, ydate, host, ydate))

just a misplaced bracket. In your current code ssh is paramiko.SSHClient() instance and its method exec_command() method returns the stdin, stdout, and stderr of the executing command, as a 3-tuple (link to docs]

answered Sep 14, 2020 at 12:08

buran

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